61460c8601
search and replace ```\n< with ```\n\n< to ensure there's an empty line before closing tags
57 lines
1.1 KiB
Markdown
57 lines
1.1 KiB
Markdown
---
|
||
id: 5900f5311000cf542c510042
|
||
challengeType: 5
|
||
title: 'Problem 451: Modular inverses'
|
||
videoUrl: ''
|
||
localeTitle: 问题451：模逆
|
||
---
|
||
|
||
## Description
|
||
<section id="description">考虑数字15.有八个正数小于15，它们与15：1,2,4,7,8,11,13,14相互作用。这些数模15的模数逆是：1,8,4 ，13,2,11,7,14因为1 * 1 mod 15 = 1 2 * 8 = 16 mod 15 = 1 4 * 4 = 16 mod 15 = 1 7 * 13 = 91 mod 15 = 1 11 * 11 = 121 mod 15 = 1 14 * 14 = 196 mod 15 = 1 <p>设I（n）是小于n-1的最大正数m，使得m modulo n的模逆与m本身相等。所以我（15）= 11。我（100）= 51和I（7）= 1。 </p><p>求3Σn≤2·107的ΣI（n） </p></section>
|
||
|
||
## Instructions
|
||
<section id="instructions">
|
||
</section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: <code>euler451()</code>应该返回153651073760956。
|
||
testString: assert.strictEqual(euler451(), 153651073760956);
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
function euler451() {
|
||
// Good luck!
|
||
return true;
|
||
}
|
||
|
||
euler451();
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
|
||
/section>
|